Air compressor



FIG. 1 is a front perspective view of an air compressor, showing my new design;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a back elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

Any broken lines in the figures illustrate portions of the air compressor that form no part of the claimed design. 

CLAIM The ornamental design for an air compressor, as shown and described. 